#!/bin/sh -e
#
# Copyright (c) 2012, Intel Corporation.
# All rights reserved.
#
# install.sh [device_name] [rootfs_name]
#

PATH=/sbin:/bin:/usr/sbin:/usr/bin

# We need 20 Mb for the boot partition
boot_size=20

# 5% for swap
swap_ratio=5

found="no"

echo "Searching for a hard drive..."
for device in 'hda' 'hdb' 'sda' 'sdb' 'mmcblk0' 'mmcblk1'
do
    if [ -e /sys/block/${device}/removable ]; then
        if [ "$(cat /sys/block/${device}/removable)" = "0" ]; then
            found="yes"

            while true; do
                # Try sleeping here to avoid getting kernel messages
                # obscuring/confusing user
                sleep 5
                echo "Found drive at /dev/${device}. Do you want to install this image there ? [y/n]"
                read answer
                if [ "$answer" = "y" ] ; then
                    break
                fi

                if [ "$answer" = "n" ] ; then
                    found=no
                    break
                fi

                echo "Please answer y or n"
            done
        fi
    fi

    if [ "$found" = "yes" ]; then
        break;
    fi

done

if [ "$found" = "no" ]; then
    exit 1
fi

echo "Installing image on /dev/${device}"

#
# The udev automounter can cause pain here, kill it
#
rm -f /etc/udev/scripts/mount*

#
# Unmount anything the automounter had mounted
#
umount /dev/${device}* 2> /dev/null || /bin/true

mkdir -p /tmp
cat /proc/mounts > /etc/mtab

disk_size=$(parted /dev/${device} unit mb print | grep Disk | cut -d" " -f 3 | sed -e "s/MB//")

swap_size=$((disk_size*swap_ratio/100))
rootfs_size=$((disk_size-boot_size-swap_size))

rootfs_start=$((boot_size))
rootfs_end=$((rootfs_start+rootfs_size))
swap_start=$((rootfs_end))

# MMC devices are special in a couple of ways
# 1) they use a partition prefix character 'p'
# 2) they are detected asynchronously (need rootwait)
rootwait=""
part_prefix=""
if [ ! "${device#mmcblk}" = "${device}" ]; then
    part_prefix="p"
    rootwait="rootwait"
fi
bootfs=/dev/${device}${part_prefix}1
rootfs=/dev/${device}${part_prefix}2
swap=/dev/${device}${part_prefix}3

echo "*****************"
echo "Boot partition size:   $boot_size MB ($bootfs)"
echo "Rootfs partition size: $rootfs_size MB ($rootfs)"
echo "Swap partition size:   $swap_size MB ($swap)"
echo "*****************"
echo "Deleting partition table on /dev/${device} ..."
dd if=/dev/zero of=/dev/${device} bs=512 count=2

echo "Creating new partition table on /dev/${device} ..."
parted /dev/${device} mklabel gpt

echo "Creating boot partition on $bootfs"
parted /dev/${device} mkpart primary 0% $boot_size

echo "Creating rootfs partition on $rootfs"
parted /dev/${device} mkpart primary $rootfs_start $rootfs_end

echo "Creating swap partition on $swap"
parted /dev/${device} mkpart primary $swap_start 100%

parted /dev/${device} print

echo "Formatting $bootfs to vfat..."
mkfs.vfat $bootfs

echo "Formatting $rootfs to ext3..."
mkfs.ext3 $rootfs

echo "Formatting swap partition...($swap)"
mkswap $swap

mkdir /ssd
mkdir /rootmnt
mkdir /bootmnt

mount $rootfs /ssd
mount -o rw,loop,noatime,nodiratime /media/$1/$2 /rootmnt

echo "Copying rootfs files..."
cp -a /rootmnt/* /ssd

if [ -d /ssd/etc/ ] ; then
    echo "$swap                swap             swap       defaults              0  0" >> /ssd/etc/fstab

    # We dont want udev to mount our root device while we're booting...
    if [ -d /ssd/etc/udev/ ] ; then
        echo "/dev/${device}" >> /ssd/etc/udev/mount.blacklist
    fi
fi

umount /ssd
umount /rootmnt

echo "Preparing boot partition..."
mount $bootfs /ssd

EFIDIR="/ssd/EFI/BOOT"
mkdir -p $EFIDIR
GRUBCFG="$EFIDIR/grub.cfg"

cp /media/$1/vmlinuz /ssd
# Copy the efi loader and config (booti*.efi and grub.cfg)
cp /media/$1/EFI/BOOT/* $EFIDIR

# Update grub config for the installed image
# Delete the install entry
sed -i "/menuentry 'install'/,/^}/d" $GRUBCFG
# Delete the initrd lines
sed -i "/initrd /d" $GRUBCFG
# Delete any LABEL= strings
sed -i "s/ LABEL=[^ ]*/ /" $GRUBCFG
# Replace the ramdisk root with the install device and include other options
sed -i "s@ root=[^ ]*@ root=$rootfs rw $rootwait quiet@" $GRUBCFG

umount /ssd
sync

echo "Remove your installation media, and press ENTER"

read enter

echo "Rebooting..."
reboot -f